On 10/26/10 11:06 AM, openafs-info-request@openafs.org wrote:
> On Mon, 25 Oct 2010 17:03:21 -0400
> Eric Chris Garrison <ecgarris@iupui.edu> wrote:
>>> > It could very well be firewall-related, it could be causing
>> > fragmenting and causing rx to retransmit.
> If you get a packet dump and are willing to share with the people here,
> we may be able to give you more information on what is being slow.
I have a dump I could share, but don't want to post it publicly. If
someone from the list would like to look at a wireshark capture (taken
during a slow transfer), email me directly.
The analysis of the wireshark capture is this:
[root@rfs4 ~]# dumpcap -w /tmp/ecg1.dumpcap -a duration:60
File: /tmp/ecg1.dumpcap
Packets: 201081 Packets dropped: 28064
[root@rfs4 ~]# capinfos /tmp/ecg1.dumpcap
File name: /tmp/ecg1.dumpcap
File type: Wireshark/tcpdump/... - libpcap
File encapsulation: Ethernet
Number of packets: 201081
File size: 202985493 bytes
Data size: 199768173 bytes
Capture duration: 59.619958 seconds
Start time: Mon Oct 25 17:18:45 2010
End time: Mon Oct 25 17:19:45 2010
Data rate: 3350692.94 bytes/s
Data rate: 26805543.53 bits/s
Average packet size: 993.47 bytes
> Also, iperf should be able to give you more statistics than just
> bandwidth. Packet loss? Latency?
iperf is blocked between the campuses, it seems, but between two
machines (which also have the same slowness) on the same campus, I get this:
[root@rfs1 init.d]# iperf -c rfs4 -p 13713
------------------------------------------------------------
Client connecting to rfs4, TCP port 13713
TCP window size: 64.0 KByte (default)
------------------------------------------------------------
[ 3] local 129.79.43.68 port 33239 connected with 129.79.43.70 port 13713
[ 3] 0.0-10.0 sec 1.07 GBytes 920 Mbits/sec
So, nothing dropped for a straight iperf test at almost full bandwidth,
but over 10% dropped at 30Mb/sec for AFS vos moves.
> You have still not said what version of OpenAFS this is... various
> versions have better or worse RX performance.
We're currently running openafs-server-1.4.11-1.1.1 on all servers.
Thanks,
Chris